Hi Alan
With ESXi 6.5 vmware tool ( 12.3.5) will not work Refer below screen shot.
https://sim.esp.spespg1.vmw.saas.broadcom.com/Interoperability

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Regard
Rajeev
VCIX-DCV, VCF Sr. Consultant
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Original Message:
Sent: Oct 11, 2024 10:05 AM
From: Alan Koop
Subject: Esxi 6.5 and VMware Tools
We have an older VMware environment that will be upgraded in Q1 of next year.
Currently we are running ESXi 6.5.0 on a host with Windows Server 2012 R2 VMs. VMware tools version 10.3 is installed on the VMs. I am being asked by our IS Security team to update to a newer version of VMware Tools (version 12.3.5). Is version 12.3.5 of VMware tools backward compatible with the version of ESXi and Windows server I am running? I thought VMware tools needed to match the host.